Screening or filtering apparatus



H-ID. WEL LS. SCREENING 0R FILTERING APPARATUS.

APPLICATION FILED SEPT. 18. I919.

vPatented July 13, 1920.

2 SHEETS-SHEET IM' NTOR Harald Donald WFzZls ATTORNEYS H. n. WELLS. SCREENING 0R FILTERING APPARATUS.

APPLICATION FILED SEPT. I8, I9I9.

Patented July 13, 1920.

2 SHEETS-S INVENTOR Harold Donald PV'eZ 2s WITNESSES A TTOR/I/EIS is a full, clear,

-WELLs, a citizen of the a resident of Glens Falls,

HAROLD DONALD WELLS, F GLENS FALLS NEW YORK;

sonnnmne on rrnrnmne APPARATUS.

Specification ofIietters Patent.

Patented July 13, 1920.

Application filed September 18, 1919. Serial No 324,429.

To all whom it may concern:

Be it known that I, HAROLD DONALD United States, and in the county of Warren and State of New York, have invented a new and Improved Screening or Filtering Apparatus, of which the following and exact description.

The invention relates to the manufacture of paper and its object is to provide a new and improved screening or filteringapparatus desi or as a pu p ed for use as a pulp thickener washer or as a water filter.

Another object is to provide an apparatus of the type referred to which has a arge capacit requires little or no labor attendants, avoi s loss of pulp, and reduces .the cost of power, wear, labor and repairs to a minimum.

Another object is to provide an apparatus ,of simple and durable construction and one that is not liable to get easily out of order.

With these and other objects in view, the invention consists of certain novel features of construction, as hereinafter shown and described and then specifically pointed out; in the claims.

A practical embodiment of the inventlon is represented in the accompanying drawings forming a part of this specification, in whlch similar characters of reference indicate corresponding parts in all the views.

Figure-l 1s a plan view of the improved screening or filtering apparatus; Fig. 2 is a side elevation ofthe same w1th theeccentrlc shaft shown in section;

Fig. 3 1s-a longitudinal central section of the same on the line 3-3 of Fig. 1;

Fig. 4 is a cross section of the same on the line 4-4 of Fig. 3 5

F1igf5 is a plan view of the eccentric shaft; an

Fig. 6 is an end elevation of the same. In the manufacture of pulp for paper, it

is often the practice after screening the pulp to remove part of the water therefrom by means of thickeners to facilitate mixing one with the other to make paper. Pulps produced by chemical processes or mixed with hemicals for bleaching, etc., require washing by adding water and'then filtering.

out the chemicals with the water before being made into paper. Also water used in the manufactureof pulp andpaper is generally filtered to remove dirt, bardi, leaves and other extraneous matter. K The apparatus presently described in detail can be used for screening therpulp, to thicken the same, or to wash the pulp and filter out the chemicals, or to filterthe water to'remove dirt, bark, leaves and other extraneous matter.

On a suitably constructed framework 10 is mounted an inclined box 11 provided be-' be screened or filtered onto the upper end of the screen plate 21. Into the compartment extends a discharge spout connected with a supply ,duct 31 for supplying pulp or other material to be screened or filtered to the compartment 25, the amount of the material. being regulated by va suitable gate 32.

The lowenend of the box 11 discharges into a discharge compartment 40. The lower end 41 of the screen plate 21 is curved downwardly and delivers the pulp or other material to a receiving compartment 42, both compartment and 42 being attached to the main frame 10.

In order-to impart -a rising and falling 1 and a longitudinal oscillating motion to the sc een 20, the following arrangement is ade: On the under side of the head compartment 25 is arranged a bearing engaging an'eccentric 51 formed on a shaft 52 fournaled in suitable bearings 53 attached to the main frame-10. On one endof the shaft 52 is secured a pulley 54 connected by belt with other machinery for imparting rotary motion to the shaft 52- to cause he eccentric 51 thereof to impart a longimovement to the screen,

tudinally shaking 20. The lower ends of the sides 23 of the screen 20 are hung on spring bars 55' attached to a crossbar 56 supported by brackets 57 fastened to the sides 58 of the box 11. It will be noticed that by the arrangement described the head end of the screen 20 receives an up and down and longitudinally shaking movement from the eccentric 51 while thelower end of thescreen 20 is held suspended pension members 55.

By reference to Fig. 3, it will benoticed I that the partitions 14: of the box 11 terminate a distance below the screen plate 21 of the screen 20, and the partitions 2 o f the screen plate 21 terminate a distince above the bottom of the box 11 but below the tops of the partitions 14 thereby providing suction and pressure compartments underneath the screen plate 21 and which compartments are sealed by the water held in the box 11 to a level corresponding to the tops-of the partitions 14-. It will be noticed that when the apparatus is in use and paper.

pulp, for instance, "is'fed onto the screen plate 21 and the screen 20 rises then air is sucked through the screen plate 210 into the suction compartments, and screen 20 descends 5 air is. forced when the out of the suction compartments through the meshes in the screen plate 21 ,The escaping air slightly lifts thepulp and the forward and backward motion given to the screen shakes the pulp down the inclined screen plate 21 to finally pass into the receiving compartment 12, from which the. pulp is conducted to a storage tank or other suitable receptacle. The water sucked from the pulp dur-' ing the suction operation of the screen passes into the box 11 and over the overflow partitions 14 to finally pass over the end 13 into the compartment 40 from which the waste water is conducted toa sewer or other I Hating thus described -my invention, 1'

claim as new and desire to secure by Letters Patent v I 1. In an apparatus of the type described, a box provided with spaced transverse parfrom the spring sus an inclined for receiving the water from titions, a screen extending into the said box and provided at the under side with spaced transverse partitions extending between the partitions of the said box, the said parti;

tions on-the box. and screen forming suction and pressure compartments underneath the screen above the box water sealing compartments in the box, an

means imparting a rising and falling and a longitudinal oscillating motion to the said screen.

2 In an apparatus of the type described, an inclined box" provided with spaced transverse .partitions, an inclined screen extending into the said box and provided at the under side with spaced transverse 'parti tions extending between the said box partitions, a receiving compartment at the up r end of the said screen and provided with transverse baflles to spread the material uniformly over the screen, discharge compartments on the lower end of the said box, one for. receiving the water from the box and the other the material discharged at the lower end of the screen, and means impart ng a rising 3. In an apparatus of the type described, box provided with spaced trans verse partitions, an inclined screen extendmg into the said box and provided'at the portions, and formin and falling and a longitudinally oscillatlng motion to the said "screen.

under side with spaced transverse partitions.

extending between the Said box partitions a" receiving compartment at the upper end of the said screen and provided with transverse baflies to spread the material uniformly over the screen, discharge compart-.

ments on the lower end of the said box, one the box and the other the material discharged at the lower end of the screen, a driven eccentric shaft, a bearing attached to the upper, end

of the said screqn and engaging the said eccentric shaft, and a spring suspension device supporting the lower end of the said screen and allowing the latter to swing lonitudinall k IIAROI D DONALD WELLS. 

